Cerium isomorphism and the – transformation in plutonium
نویسندگان
چکیده
We use the thermodynamic model introduced by Aptekar’ and Ponyatovskiy for the – transformation in cerium metal to study the properties f plutonium metal. The model describes the – transformation in Pu and explains the minimum in the melting versus pressure curves for both aterials. Ga stabilization of the -phase of Pu is explained in terms of a first order transition between the two phases. The model parameters found or Pu are similar to those found earlier for Ce. 2006 Elsevier B.V. All rights reserved.
منابع مشابه
Solid-state synthesis of monazite-type compounds containing tetravalent elements.
On the basis of optimized grinding/heating cycles developed for several phosphate-based ceramics, the preparation of brabantite and then monazite/brabantite solid solutions loaded with tetravalent thorium, uranium, and cerium (as a plutonium surrogate) was examined versus the heating temperature. The chemical reactions and transformations occurring when heating the initial mixtures of AnO2/CeO2...
متن کاملElectron backscatter diffraction of a plutonium–gallium alloy
An experimental technique has recently been developed to characterize reactive metals, including plutonium (Pu) and cerium, using electron backscatter diffraction (EBSD). Microstructural characterization of Pu and its alloys by EBSD had been previously elusive primarily because of the extreme toxicity and rapid surface oxidation rate associated with Pu metal. The experimental technique, which i...
متن کاملInvestigations in Gallium Removal (ANRCP-1997-3)
Gallium present in weapons plutonium must be removed before it can be used for the production of mixed-oxide (MOX) nuclear reactor fuel. The main goal of the preliminary studies conducted at Texas A&M University was to assist in the development of a thermal process to remove gallium from a gallium oxide/plutonium oxide matrix. This effort is being conducted in close consultation with the Los Al...
متن کاملDecontamination Study of Some Noticeable Fission Products in the Actinides Recovery by Truex Process
Decontamination performance of some noticeable fission products from TRU elements by the TRUEX process was calculated with a multistage extraction simulation code. The batch extraction data of molybdenum, palladium, antimony, and cerium, which have been obtained in our related TRUEX studies, were provided for the calculation. For uranium, plutonium, and americium, literature data were used. A m...
متن کاملCoherence–incoherence crossover in the normal state of iron oxypnictides and importance of Hund's rule coupling
A new class of high-temperature superconductors based on iron and arsenic was recently discovered (Kamihara et al 2008 J. Am. Chem. Soc. 130 3296), with the superconducting transition temperature as high as 55K (Ren et al 2008 Chin. Phys. Lett. 25 2215). Here we show, using microscopic theory, that the normal state of the iron pnictides at high temperatures is highly anomalous, displaying a ver...
متن کامل